Correct Option
The correct option is (c) 2 and 3 only.
Explanation
Pathogens are biological agents that cause disease or illness to their host. They include a wide range of microorganisms such as bacteria, viruses, fungi, protozoa, and helminths.Statement-wise Analysis:
- Statement 1 is Incorrect. Pathogens are, by definition, harmful microorganisms that cause diseases. While there are many beneficial microorganisms (such as gut bacteria or those used in fermentation) that protect humans or aid biological processes, they are not classified as pathogens.
- Statement 2 is Correct. Pathogens can enter the human body through various means of transmission. Common routes include breathing in contaminated air (airborne), consuming contaminated food or water (waterborne/foodborne), or through direct contact with infected individuals or surfaces.
- Statement 3 is Correct. Many pathogens rely on intermediate carriers, known as vectors, to transmit diseases from one host to another. For example, the female Anopheles mosquito acts as a vector for the Plasmodium parasite, which causes malaria.
Key Takeaway: Pathogens are disease-causing agents distinct from beneficial microbes. They transmit diseases through direct contact, contaminated air/water/food, or vectors like mosquitoes and ticks.